Won't power up.

My computer will not stay on. When I push the power button the lights will come on for about 3 secs, but then power down (no matter if the computer is plugged into power or not). It does however show when the battery pack is plugged in.

That sounds like a daughter card has come loose. It is likely the video card.

Your computer has a motherboard with cards that affix to it: "daughter cards" these cards are modules that perform certain functions. The video card is a daughter card. When you press power, a P O S T (power on self test) occurs. if the test fails, pc goes off. You likely need to take the machine in to a shop and have them break it down and reassemble it. (I had a similar issue recently with a dell inspiron 8500)

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Related Questions:

1. CRT or LCD? 2. Do you have an image of any kind for that 45 sec.?When it drops out after 45 sec, do you have any strange behavior as you look at the screen (colors, blinking, lines, squiggles, noises, smells)?3. When failing, does the power drop out (ON light goes OFF)?How long do you need to wait until you can turn it ON again?4. What is the status of your screen saver/power saver? 45 sec seems pretty short but it's still possible.5. What does the manufacturer's website have to say about this problem? What do other users have to say when you search for your model?

I know these are just more questions but your question is too generic to offer specific comments that might be more useful.

Remove the battery and leave off for about 1 minute. Put the battery back in place and press the power button to turn the unit on. immediately after you see system light come on, press and hold the power button and see if it shuts off after a few seconds. If not, then its likely your motherboard is defective.

these a couple things you can try to reset,if resetting dont work you will have a amp problem.Try pushing and holding down these 3 buttons s.speaker b and att and exit buttons for at least 3 sec or more.should reset.If not also try pushing and holding down mult speaker and exit and att buttons together for at least 3 or more seconds.if still shuts down you will have shorted transistors inside of unit.

As there are no specific codes for the Dynex TV you have the choice of either using the Auto or Learn method. The following are instructions for both:

AUTO Method

1. Press & Hold (about 3 sec.) the [DEVICE]
button on the JUMBO Remote....llight will stay solid.2. Now just
press the [POWER] button (only) ONCE while pointing at the device...it
will start sending codes approximately every second. (Don't keep
pressing the power button as instructions indicate.)3. TIMING IS
EVERYTHING HERE. (It may take 5 minutes to find your devices code.)4.
AS SOON AS the power goes off...press the [ENTER] button on the JUNBO
Remote.5. Now pressing the [POWER] button should power up/down the
device.

---- any buttons not programmed will have to be handled
using the LEARN method ---

LEARN Method

1. Press &
Hold (about 3 sec.) the [DEVICE] button on the JUMBO Remote....it'll
stay solid.2. Press the [LEARN] button on the JUMBO Remote. (light
will immediately blink rapidly.)3. Now Press the {NEEDED} button to
program. (light will stay solid)4. Now (1 to 2 inches away) have the
ORIGINAL Remote pointed at the JUMBO Remote and press the {DESIRED}
button on the ORIGINAL Remote.5. It blinks rapidly while
sending...then a slower steady blink once "LEARNED" correctly.

***
Not all buttons work properly with the "LEARN method". Some you will
need to "associate" with an alternate button on the JUMBO Remote. *

(with
light out, press and hold power button while amber light comes on and
goes off again holding power button 2-3 secs after light goes out.)
repeat whats in parenthesis until computer turns on it should only take about 6, 7 tries.

After the computer boots, you may want to setup cmos or boot into windows.After you shutdown, unplug power cord for 5-10 secs then plug it back in. Press and hold the power button, computer should come on.I found that's the only way to turn on the computer.If you shutdown and don't unplug power cord the computer may not boot, mine didn't.Strange I'd say